关于Matlab里面的四个取整（舍入）函数：Floor, Ceil, Fix, Round的解释_小兔的窝窝

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关于Matlab里面的四个取整（舍入）函数：Floor, Ceil, Fix, Round的解释

(2007-06-15 15:45:30)

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分类：学术问题

floor：朝负无穷方向舍入

B = floor(A) rounds the elements of A to the nearest integers less than or equal to A.

ceil：朝正无穷方向舍入

B = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A.

fix：朝零方向舍入

B = fix(A) rounds the elements of A toward zero, resulting in an array of integers.

round：四舍五入

B = round(A) rounds the elements of X to the nearest integers.

Example：

a= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];

floor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]

ceil(a)= [ 0, -2, 0, 1, 1, 2, 3, -1+3i]

fix(a)= [ 0, -2, 0, 0, 0, 1, 2, -1+2i]

round(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]

注：For complex X, for all the four fuctions the imaginary and real parts are rounded independently.

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